<template>
    <div class="tags-view-container">
        <scroll-pane ref="scrollPane"
                     class="tags-view-wrapper">
            <router-link v-for="tag in visitedViews"
                         ref="tag"
                         :class="isActive(tag)?'active':''"
                         :to="tag.fullPath"
                         :key="tag.path"
                         tag="span"
                         class="tags-view-item"
                         @click.middle.native="closeSelectedTag(tag)"
                         @contextmenu.prevent.native="openMenu(tag,$event)">
                {{ tag.title }}
                <span class="el-icon-close"
                      @click.prevent.stop="closeSelectedTag(tag)" />
            </router-link>
        </scroll-pane>
        <ul v-show="visible"
            :style="{left:left+'px',top:top+'px'}"
            class="contextmenu">
            <li @click="refreshSelectedTag(selectedTag)">{{ $t('tagsView.refresh') }}</li>
            <li @click="closeSelectedTag(selectedTag)">{{ $t('tagsView.close') }}</li>
            <li @click="closeOthersTags">{{ $t('tagsView.closeOthers') }}</li>
            <li @click="closeAllTags">{{ $t('tagsView.closeAll') }}</li>
        </ul>
    </div>
</template>

<script>
import ScrollPane from '@/components/ScrollPane';

export default {
    components: { ScrollPane },
    data() {
        return {
            visible: false,
            top: 0,
            left: 0,
            selectedTag: {}
        };
    },
    computed: {
        visitedViews() {
            return this.$store.state.tagsView.visitedViews;
        }
    },
    watch: {
        $route() {
            this.addViewTags();
            this.moveToCurrentTag();
        },
        visible(value) {
            if (value) {
                document.body.addEventListener('click', this.closeMenu);
            } else {
                document.body.removeEventListener('click', this.closeMenu);
            }
        }
    },
    mounted() {
        this.addViewTags();
    },
    methods: {
        isActive(route) {
            return route.path === this.$route.path;
        },
        addViewTags() {
            const { name } = this.$route;
            if (name) {
                this.$store.dispatch('addView', this.$route);
            }
            return false;
        },
        moveToCurrentTag() {
            const tags = this.$refs.tag;
            this.$nextTick(() => {
                for (const tag of tags) {
                    if (tag.to.path === this.$route.path) {
                        this.$refs.scrollPane.moveToTarget(tag.$el);

                        // when query is different then update
                        if (tag.to.fullPath !== this.$route.fullPath) {
                            this.$store.dispatch('updateVisitedView', this.$route);
                        }

                        break;
                    }
                }
            });
        },
        refreshSelectedTag(view) {
            this.$store.dispatch('delCachedView', view).then(() => {
                const { fullPath } = view;
                this.$nextTick(() => {
                    this.$router.replace({
                        path: '/redirect' + fullPath
                    });
                });
            });
        },
        closeSelectedTag(view) {
            this.$store.dispatch('delView', view).then(({ visitedViews }) => {
                if (this.isActive(view)) {
                    const latestView = visitedViews.slice(-1)[0];
                    if (latestView) {
                        this.$router.push(latestView);
                    } else {
                        this.$router.push('/');
                    }
                }
            });
        },
        closeOthersTags() {
            this.$router.push(this.selectedTag);
            this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
                this.moveToCurrentTag();
            });
        },
        closeAllTags() {
            this.$store.dispatch('delAllViews');
            this.$router.push('/');
        },
        openMenu(tag, e) {
            this.visible = true;
            this.selectedTag = tag;
            const offsetLeft = this.$el.getBoundingClientRect().left; // container margin left
            this.left = e.clientX - offsetLeft + 15; // 15: margin right
            this.top = e.clientY;
        },
        closeMenu() {
            this.visible = false;
        }
    }
};
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.tags-view-container {
    height: 34px;
    width: 100%;
    background: #fff;
    border-bottom: 1px solid #d8dce5;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);
    .tags-view-wrapper {
        .tags-view-item {
            display: inline-block;
            position: relative;
            cursor: pointer;
            height: 26px;
            line-height: 26px;
            border: 1px solid #d8dce5;
            color: #495060;
            background: #fff;
            padding: 0 8px;
            font-size: 12px;
            margin-left: 5px;
            margin-top: 4px;
            &:first-of-type {
                margin-left: 15px;
            }
            &:last-of-type {
                margin-right: 15px;
            }
            &.active {
                background-color: #42b983;
                color: #fff;
                border-color: #42b983;
                &::before {
                    content: "";
                    background: #fff;
                    display: inline-block;
                    width: 8px;
                    height: 8px;
                    border-radius: 50%;
                    position: relative;
                    margin-right: 2px;
                }
            }
        }
    }
    .contextmenu {
        margin: 0;
        background: #fff;
        z-index: 100;
        position: absolute;
        list-style-type: none;
        padding: 5px 0;
        border-radius: 4px;
        font-size: 12px;
        font-weight: 400;
        color: #333;
        box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
        li {
            margin: 0;
            padding: 7px 16px;
            cursor: pointer;
            &:hover {
                background: #eee;
            }
        }
    }
}
</style>

<style rel="stylesheet/scss" lang="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
    .tags-view-item {
        .el-icon-close {
            width: 16px;
            height: 16px;
            vertical-align: 2px;
            border-radius: 50%;
            text-align: center;
            transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
            transform-origin: 100% 50%;
            &:before {
                transform: scale(0.6);
                display: inline-block;
                vertical-align: -3px;
            }
            &:hover {
                background-color: #b4bccc;
                color: #fff;
            }
        }
    }
}
</style>
